View Compilation Error

0_0_38257401_16786.cpp: In function 'void NumTowers()':
0_0_38257401_16786.cpp:6:15: error: 'scanf' was not declared in this scope
  scanf("%d",&C);
               ^
0_0_38257401_16786.cpp:21:24: error: 'printf' was not declared in this scope
   printf("%d\n",t[0][0]);
                        ^